Pipe coupling



FIG. 1 is an isometric view of our design for a pipe coupling;

FIG. 2 is a front view thereof, the rear view being a mirror imagethereof;

FIG. 3 is a left side view thereof, the right side view being a mirrorimage thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The broken lines depict portions of the pipe coupling that form no partof the claimed design.

CLAIM We claim the ornamental design for a pipe coupling, as shown anddescribed.